Will work with:

echoecho is a mobile app to find your friends, quickly and securely, whenever you want, with two clicks.

Echoecho is the simplest answer to the world’s most-texted question: Where are you? The application gives you a quick and easy way to find a friend, family member or colleague and help them find you. For free. The app works anywhere in the world across multiple platforms including Android, iPhone, Blackberry, and Nokia.